[Radiance-general] materials and texfunc

[Lars O. Grobe]

Hi,

the typical way to automize the steps required to get an image from  
yor scene is to write a rif-file and let rad (look at the manpage of  
rad) determine what has to be done. It is a bit like using make. I  
would recommend not to copy one of the complete and complex rif-files  
coming with the examples, but to start with a minimal one.

This again is very nicely doable following Axel's tutorial!

Good luck, cheers, Lars.

--
Dipl.-Ing. Architect Lars O. Grobe

On Jul 8, 2010, at 3:25, Jia Hu <hujia06 at gmail.com> wrote:

> Thank you very much. I am learning the tutorial of Axel Jacobs. It  
> is very good.
>
> In Ubuntu, I built materials,  rad, sky.mat, sky.rad and .vf. files,  
> when I use oconv to compile them, I have to input the command into  
> the terminal window of Ubuntu to execute the command. Can I just run  
> a script which contains multiple commands such as oconv and rvu?
>
> Thanks,
>
> Jia
>
> On Wed, Jul 7, 2010 at 12:46 AM, Rob Guglielmetti  
> <rpg at rumblestrip.org> wrote:
> Hi Jia,
>
> Some quick answers:
>
> 1. The Luxal resource is an excellent starting point for values, but  
> yes measurement of your own samples is the best way. The macbethcal  
> procedure that is documented in Rendering with Radiance is very  
> useful, too. If Ecotect is giving RGB values in the 0-255 range,  
> then yes you would divide the color channels by 255 to get a 0-1  
> value that Radiance expects.
>
> 2. textfunc is a Radiance material primitive, not a program, so  
> there is no manual page for it. Its use is documented in the  
> Radiance reference manual and several other places. Linkage:
>
> http://radsite.lbl.gov/radiance/refer/materials.pdf
> http://radsite.lbl.gov/radiance/refer/refman.pdf
>
> 3. To use a .png as a pattern, you need to save it in .hdr format  
> for Radiance to use it. if you first convert the .png to .tiff, you  
> can then use ra_tiff to convert it to .hdr format thusly:
>
> ra_tiff -r pattern_image.tif pattern_image.hdr
>
> Axel Jacobs has some good stuff on using images as patterns in his  
> tutorials.
>
> Hope this helps...
>
> - Rob
>
> On Jul 6, 2010, at 8:25 PM, Jia Hu wrote:
>
>> Hi all:
>>
>> I have some questions.
>>
>> (1) Besides measure, through which methods I can find the common  
>> values of material property, such as RBG, reflectivity and  
>> roughness value? I know two places: Colar picker at http://luxal.eu/resources/radiance/index.shtml 
>>   and Ecotect which provides some examples, but RBG values are not  
>> 0-1, should I divide the RBG value by 255?
>>
>> (2) When typing "man texfunc", I can not find the command. Is that  
>> my installation problem?  I use ubuntu and Radiance version 4.0.
>>
>> (3) Is that right I can add texture and pattern by using procedural  
>> functions (e.g. wrinkle.cal) and bitmaps accoring to http://www.artifice.com/radiance/rad_materials.html 
>>  ?  If I have an image with an .png extension, how can I add the  
>> image as the the pattern ?
>>
>> Thank you.
>>
>> Jia
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>
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